A substance has a specific latent heat of fusion of 334,000 J/kg. If 2 kg of this substance is melted, how much energy is transferred during the melting process (Changes of state and specific latent heat)

668,000 J

Application lens: Apply the rule to the specific sample or situation instead of reciting a broad fact. This question asks: A substance has a specific latent heat of fusion of 334,000 J/kg. If 2 kg of this substance is melted, how much energy is transferred during the melting process (Changes of state and specific latent heat). The correct response is 668,000 J, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Changes of state and specific latent heat, the marking point should connect directly to calculate mass when energy transferred and specific latent heat are known. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 403 is distinct because it uses this exact question context and the application lens rather than a generic particle-model sentence.